Machine for testing typewriting ribbons, carbon paper, etc.



Nov. 27, 1928. LGQEAQQ w. P. PEMBROKE MACHINE FOR TESTING TYPEWRITING RIBBONS, CARBON PAPER, ETC

Filed July 6, 1925 4 Sheets-Sheet l A/s ATTORNEYfi Nov. 27, 1928. 11,@%,4%

w. P. PEMBROKE MACHINE FOR TESTING TYPEWRITING RIBBON-S, CARBON PAPER, ETC

Filed July 6, 1926 4 Sheets-Sheet 2 em ATTORNEY 6 W. P. PEMBROKE Nev. 27, 1928.

MACHINE FOR TESTING TYPEWRITiNG RIBBONS, CARBON PAPER, ETC

Filed July 1926 4 Sheets-Sheet 4/6 ATTORN 5Y6 Nov. 27, 1928 I L63A941 w. P. PEMBROKE MACHINE FOR TESTING TYPEWRITING RIBBONS, CARBON PAPER, ETC

Filed July 6, 1926 4 Sheets-Sheet 4 Patented Nov. 27, 1928..

sir

W'INEIELD. B. PEMBROKE, OF ROCHESTER, NEW YOR ASS-EGNQR .TO, KEE LOX.MANU-.-

FACTURING COMPANY, OF ROCHESTER, NE'W; YORK.

MACHINE FGR TESTING TY'EEHRITING RIBBOBTS, CARBON PAPER, ETC.

Application filed July 6,

The present invention relates to wear down testing machines for typewriting: ribbons, carbon paper and iother and similarm eri'al, and an object of'the invention is to 131 ride a construction which will asubj ect the material being tested for its wear-down proper es to .a numher of successive impacts of equal force at on'eand :the same point until the material wears down. Anotherobiectaoftthe iirvemion is to provide a holding means for the ribbon, carbon and other material which vwill permit the material tobe held without undue tension thereon which tends to reducethe wear down properties ofLthe material... Still another object Oflillfi'i'IlVGIliIlOll :ls toiassociate with the wear. down inecharnsm :a feeding mechanism which will automatically .feed. a record sheet rel-atively'to the: wear down mechanism and the holding means for the materlal bang tested so astodetehninethe number of ini- V pressions made by the mechanism in the test.

To these and other ends, the invention consistsof certainpart-s and combinationsof parts, all ofawhichwillhe hereinafterdescri'bed thenovel features bGlDgQDOlHtQCl out in the appended claims;-

' In the drawings Fig. lzispa plan view of a wear down testing Fig. Sis a central longitudinal vertical. 'secl j tionthrough the machine;

Fig. 9 is an enlarged fragmentary vertical section in the plane of'theplaten;

Fig. 10 isan enlarged sectionof'the spring adjustingmeans.

' In the embodiment ofthe invention, lindicate'srthesframe; of the iniachine. This frame supports a weardeWmech-anism which comprises,- in this instance, a platen 2 preferably in th'e form of a roller having a knurled wheel on: the shaft thereof through which the platen may beturned. This platen is adapted 1926. Serial no. 120,899.

to support a record sheet 4 the latter being fed tothe platen over a feedingtable 5 around the underside of the platen between the latter and a. resiliently mounted roller 6, thence upwardly in front of the platen between the latter and two pressure rollers Y and 8, and finally above the platen and under spring-retaining fingers 9 The turning of the platen clockwise, as illustrated in Fig. 8, feeds the record sheet under the platen, thence upward; 1y over the platen and .rearwardly overthe discharge plate 10. Also formingpart of the wear down mechanism are the impact devices 11 in the form of type, there being provided, in this instance, ten of such type, but it is apparent thatthe number thereof isimmaterial. These type are supported on levers 12 which are independently pivoted on. shaft 13 which is held againstturning in the frame 1 and which also has surrounding it spacing rings 14 holding the levers '12 in spaced relation to each other and to the frame. 7 These levers, in this instance, are all of equal length and eachsupportsthe type in a line parallel with the ElXlSIOf turningofthe platen. Each lever is urged toward the platen ebyits inclividualspring 15, one end of which issecured at 16 to a lever, while the opposite end issecured at 17 to a rod 18 which is mounted within a screw 19 adjustable in arod 20 supported on the frame 1, the rod 18"being connected'to the screw 19 in such a manner that whileit moves axially with the screw, it does not turn with the screw so that'the adjustment ofZthe screw 19 does not cause any turning action on the spring 15. It will thus be seenth'at the ten sions on the -springsr15 may be adjusted to correspond as nearly as possible to each other. With the end of'prev'enting undue vibra tion of the type carrying levers 12 a guide 9 frame 21 is provided, provided-with slots 22 in which the levers 12 operate,the walls of said slots guiding the leversintheir upward and downward movements. The upper ends 5230f these slots act as abutments to limitthe upward movements of the levers, these abutments making it impossible to carry each lever above a certain position so that2the upward'movementof the lever is defined.

The operating means for the type carrying levers embodies, in this instance, a drum, 24 .which is rotatably mounted on the frame of the machine andhas on its'shaft a cranlt handle 26 through which the drum'may be turned." This drum carriesa plurality of-opill crating devices, one for each impactlever. These operating devices are in the term of segments 2? having curved "faces 28 concentric with the axis of turning of the drum and abutment faces 29 substantially radial to Q1 axis oi? turning. The segmental inemhmrs are supported on stems 30 which lit int-o ra "*il bores 31 in the drum 24- and are held therein adjustably by set screws 32. Each segmental member is radially shitted with reference to the one next to it so as to form about the drum a. substantial helix and to operate on the lovers successively from one side of the series of levers t other. These segmental membe do not extend completely about the drum so that the drum rotates tor a certain period without engaging any of the levers. When the drum is rotated clockwise shown in Fig. 1, the abutment surface 29 of each segment or operating device first eng a lever and the drum and lever move together about their causing the lever to elevate the type or impact devices agains the action of one of the springs 15. 'lhercattcr the lever rides oil the aoutment surface 29 and onto the curved surface '28 thereby permittingthe drum to have a lost motion connection with the lever while holding the lever inits elevated position. apparent that if the abutment surface should strike the lever with force and then the lever should be immediately released. it would be impossible at all times to raise the lever to the same position as the elevation of the lever would depend upon the force of impact between the operating devices and the lever. In this construction, owing to the fact that alter the abutment 29 has hit the lever, the latter cngages the surface 23 and the lever is held by said surface for a time in a stationary elevated position, such elevated position is clearly defined and, at the same time all vibration in the lever is stopped before the latter descends under the action. of its spring, so that, on the descent, the spring takes hold of the leverwithout any outside interference due to vibrations or diilercntelevations and the lever descends each time with the same force against material being tested. apparent that by adjusting the set nent through the stem and the adjusting screw 31, the throw of the lever will be varied. The ad justment of each segment should be such that the lever when raised will be slightly below the stop 23, tl e surface 23 permitting the lever to swing upwardly to the stop but stopping it after very small downw movement and holding it in an elevated p tion hntil the lever descends under the act of its spring. The lever in descendii-ig strikes against the abutment plate 33 which holds it outof contact with the platen, the levers being reduced between this abutment plate and the type or impact de ices 31 so that the levers will yield in order to cooperate with the platen after their movements have been stopped by the stop or abutment plate The holding means for the material tested embodies in this instance, a series of pins 3% supported at one side of the roller platen 2 on the frame of the machine and over which the mate ial to be csted is fitted a lever 36 pivoted at 3T hen being moved downwardly to one side of the pins or pri'ijections to hold the materia on the pins and, at the same time, torpro ect the user against injury from the pins. The material held the opposite ot the roller by a means which prevents the material being ield under undue tension. This means, in th 'ns nee, embodies a plate 38 over the upper straight eoge oi which the material is passed; and holding lever 39 pivoted at ll) and swung downwardly to trictionally hold the material. a inst the outer face of t illS plate 33 as illustrated in Fig. 9. The lower ends of the pins 3-l and the upper edge of the plate 38 are substantially in the same plane so that the material is held in a parallel plane with the axis of turning of the roller -9 but slightly spaced from the roller. lit 1 135542111 time thestop plate 33 normally holds tvpe faces slightly above the material betester illustrated in Fig. lf undue tension isplaoed on the material 35 to be tested, then the first type hitting this mate rial will relieve the tension by pulling one end of the material through the frictional clamping means 38 and 39 and thereafter the tension on the material will be substantially constant.

before pointed out, the operating devices on the operating drum 2% are spaced so a "an as turns, LlllS pitrnan being guided la sleeve t-l which is mounted to rock on a pivot pin on the main frame 1 of the machine. The end of this pitman is pointed an for en 'age- ,d serves as a ratchet tooth ment with. a toothed ratchet wheel ll arcenteri device cooperates with this toothed ratchet to hold it in its'adjusted posi' on. This centering lever 48 is in the form at a belicranl: lever pivoted at l to the frame of the machine and having a roller at one end cooperating with the ratchet wheel and its other end engaged by a U shaped spring 51 which urges said roller 50 toward the ratchet wheel l7 while permitting the rollerto yield when the ratchet wheel 47 is turned on the pawl d6 on the pitman d3.

It is apparent that the eccentric wrist pin 42 causes the pitman to rock and to slide. On the forward movement the pawl 46 is thrown into engagement with the ratchet wheel and moves the ratchet wheel ina direction to shift the platen which also shifts the record sheet.

On the return movement of the pitmansb the latter throwsthe pawl 4E6 upwardly out of engagement with the ratchet wheel and moves the pawl rcarwardly for its return movement.

From the foregoing it will be seen that there has been provided a wear down testing machine for typewriting ribbons, carbons, etc, in which there is provided a holding means for the material to be tested so constructed that undue tension on the material cannot be maintained, thus preventing an improper testing of the material, as might be the'case if the material were held under ten sion. There has also been provided a novel means for automatically effecting the shift ing of the record sheet after the impact devices have completed their movement, so

tion of a spring over which the operator has no control through the operating member. All vibrations in the impact devices which would interfere with the proper test of the material have been eliminated.

lVhat I claim as my invention and secure by Letters Patentis 1. A wear down testing machine for type.- writing ribbons, carbons and thelilre-comprising a platen, means for holding material desire to to be tested in cooperation with the platen, an

impact device for cooperating with the material and the platen, a lever carrying SZIlClJHP- pact device and having a resilient portion be- .tween the impact device and the pivot of the lever, said lever having a normal tendency to move toward the platen, a. stop engaging said lever and limitingthe movement of thelever toward the platen so that the resilient port-ion bends to permit the impact device to strike the platen, and means for moving said lever away from the platen, said means having provision for holding said lever against movement for a limited time to cause said lever to assume a definite position away from the platen on each operation thereof in order that successive strokes of the lever will be uniform.

2. A wear down testing machine for typewriting ribbons, carbons and the like comprising a platen, means for holding material to be tested in cooperation with the platen, an impact device for cooperatingwith the material and the platen, a lever carrying said impact device and having a resilient portion be tween the impact device and the pivot of the lever, said lever having a normal tendency to move toward the platen, a stop engaging said lever and limiting the movement of the lever toward the platen so that the resilient portion bends to permit the impact device to strike the platen, means for moving said lever away from the platen, said means having provision for holding said lever against movement for a limited time to cause said lever to assume a definite position away from the platen on each operation thereof in order that successive strokes of the lever will be uniform, said means comprising a rotary member and an operating device thereon having an abutment surface which eifects the movement of the lever to carry the impact device away from the platen, and a curved surface which cooperates with the lever during the rotation of the member to hold the lever temporarily in stationary position.

A wear down testing machine of the class described comprising a platen, means for holding material to be tested in cooperation with the platen, a plurality of impact devices for cooperating with the material and the platen, levers carrying said impact devices and each having a resilient portion between its impact device and its pivot, said levers having a normal tendency to move toward the platen, a stop for engaging all of said levers between their pivots and their resilient portions, and means for moving said levers away from the platen embodying a rotary member, a plurality of operating devices thereon, one for each lever, each having an abutment surface which eii'ects the movement of its lever to carry the impact device thereon away from the platen, and each having a curved surface substantially concentric with the axis of turning of the rotary member to hold its lever temporarily in stationary position, said operating devices being independently adjust-able toward and from the center of rotation of the rotary member.-

WINFIELD r. rnrv'mnonn. 

